Why do you need two forms.
Just make one form and hide the fields who are not support on the web if you're on the web.
Go to the field properties and choose for Hide Paragraph for Webbrowser in the last tab.

You can go to the doclibrary template to seen how they do that.
I think this is the easiest way of work

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Sorry if I miss something, but I id this in R4.6 with one empty form containing only one computed subform formula; deciding web or client.
So the subform was the realy form for NotesClient or another for WebUser.

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Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

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